/Engine/Source/Runtime/Slate/Public/Framework/Application/SlateApplication.h
Get a list of all top-level windows in the application, excluding virtual windows.
An array of all current top-level SWindows.
virtual const [TArray](API\Runtime\Core\Containers\TArray)< [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWindow](API\Runtime\SlateCore\Widgets\SWindow) > > GetTopLevelWindows() const